Class: Watcher::LogWatcher

Inherits:
Base show all
Defined in:
lib/watcher/log_watcher.rb

Overview

Watches a log file for a given regular expression. This watcher will start a background thread that tails the log and matches against the regexp.

The current implementation is not tested against logs with very high load.

Options

logfile

The log file to watch (required)

match

A regular expression against which the log file will be matched (required)

*interval_first, interval_max*

The start and the max value for waiting on an unchanged log file. They default to 60 (1 minute) and 300 (5 minutes). The log file will be considered stale and reopened after max_value * 3.

Warning

Depending on your Ruby implementation and platform, the background thread may not be taken down if Watchdogger explodes during runtime.

On a clean exit, all threads will be cleanly shut down, but if you kill -9 it, you may want to check for any rogue processes.

Instance Attribute Summary

Attributes inherited from Base

#name, #severity

Instance Method Summary collapse

Methods inherited from Base

#setup_actions

Constructor Details

#initialize(options) ⇒ LogWatcher

Returns a new instance of LogWatcher.



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# File 'lib/watcher/log_watcher.rb', line 27

def initialize(options)
   @file_name = options.get_value(:logfile, false)
   @match_str = options.get_value(:match, false)
  
   @interval_first = options.get_value(:interval_first, 60).to_i
   @interval_max = options.get_value(:interval_max, 300).to_i
  
   watch_log # Start the watcher
end

Instance Method Details

#cleanup ⇒ Object 



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# File 'lib/watcher/log_watcher.rb', line 52

def cleanup
  @log_watcher.kill if(@log_watcher && !@log_watcher.stop?)
end

#watch_it! ⇒ Object 



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# File 'lib/watcher/log_watcher.rb', line 37

def watch_it!
  unless(@log_watcher.status) # Restart the watcher if killed for some reason
    dog_log.warn { "Log watcher on #{@file_name} died? Restarting..." }
    watch_log
  end
  is_triggered = false
  if(triggered?)
    is_triggered = "Found #{@match_str} in #{@file_name}"
    reset_trigger
  end
  is_triggered
rescue Exception => e
  "Exception running the log watcher: #{e}"
end